修补Python类和Python类的方法有什么区别

我认为打补丁的正确方法是模拟Python类，然后在打补丁的类上调用.return_value，但我不确定为什么.假设我有一些代码:

Class.py:

class SomeClass:
  def __init__(self, some_value):
    self.some_value = some_value

  def add_to_value(self, add_value):
    self.some_value = self.some_value + add_value

Function_thing.py:

from my_pkg.class import SomeClass

def some_function():
    some_class_instance = SomeClass(5)
    some_class_instance.add_to_value(6)

test_Function_thing.py:

from my_pkg.function_thing import some_function
class TestSomeFunction(TestCase)
  # This works, and it knows the function was called with 6
  @patch("my_pkg.function_thing.SomeClass")
  def test_some_function_01(self, mock_some_class):
    instance_mock = mock_some_class.return_value
    some_function()
    instance_mock.add_to_value.assert_called_with(6)

  # This does not work.
  @patch("my_pkg.function_thing.SomeClass.add_to_value")
  def test_some_function_02(self, mock_add_to_value):
    some_function()
    # This succeeds.
    mock_add_to_value.assert_called_once()
    # This fails, saying it wasn't called with 6 but some object
    mock_add_to_value.assert_called_with(6)

似乎，为了让模拟正确理解类是如何调用的，我们不能将函数作为一个整体来模拟.但我们可以断言该函数已被调用.我认为，要么断言函数被调用会失败，要么断言函数是如何调用的，或者两个都会成功.谢谢您提供的信息！